* Methane: Neptune's atmosphere is primarily composed of hydrogen and helium, but it also contains a significant amount of methane. Methane strongly absorbs red light, but reflects blue light.
* Scattering: The blue color we see is a result of the way sunlight interacts with the methane in Neptune's atmosphere. The blue light is scattered more effectively than other colors, giving the planet its distinctive blue hue.
It's worth noting that while Neptune is known for its blue color, it's actually much darker than Uranus, which is also a blue planet. The deeper blue of Neptune is likely due to the thicker and more turbulent nature of its atmosphere.
